September in Si Racha averages a daily high of 33°C. Expect roughly 22.1 wet days totalling 298.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Si Racha is November–February.
Based on CHON BURI, TH (22.3km), 1995–2024. 17 years of September data.